The invention discloses a method for preparing
tungsten-
yttrium square billets, which comprises the following steps: a. dispersing
yttrium nitrate aqueous solution in a spraying mode evenly and
coating the
yttrium nitrate aqueous solution on the surface of
ammonium paratungstate, and performing mixing agitation, heating, and
drying at the same time to obtain
tungsten-yttrium
coating powder after
drying; and b. performing primary and secondary reductions, compaction, presintering and incipient fusion
sintering on the
tungsten-yttrium
coating powder to be prepared into the uniform tungsten-yttrium square billets with
metallicity, wherein the incipient fusion
sintering process comprises that the temperature is increased for 10 to 30 minutes and the temperature is kept for 20 to 50 minutes, and the
electric current in the process of keeping the temperature is between 2,500 and 4,000 amperes. The method has a simple process and prepares the tungsten-yttrium coating
powder by adopting the spraying mode, thus the even distribution degree of elements added to square billet raw materials is ensured, and the tungsten-yttrium coating powder with comparatively even dispersion; besides, the process of the subsequent incipient fusion
sintering is controlled to raise the temperature for 10 to 30 minutes, keep the temperature for 20 to 50 minutes, and keep the
electric current in the process of keeping the temperature between 2,500 and 4,000 amperes, thus each point of the prepared tungsten-yttrium square billets is volatilized evenly; and under the cooperation of the method and the incipient fusion sintering, the prepared tungsten-yttrium square billets have good evenness.